Blowpipe.



A. W. A. BARTLETT & R. M. KEER.

BLOWPIPB.

APPLIOATION FILED MAB. 1a, ma.

1,106,914. Patented 111g. n, m41.

FFME.

ARTHUR W. A. BARTLETT AND ROBERT IVI. OF DETROIT. MICHIGAN, ASSIGNORS TO DETROIT DENTAL MANUFACTURING COMPANY, OF DETROIT, MICHIGAN, A

CORPORATION OF MICHIGAN.

BLOWIIPE.

Moenia.

To all 'whom t may concern:

Be it known that we, ARTHUR W. A. BART- LETT, a subject of the King of Great Britain and Ireland, and ROBERT M. KERR, a citizen of the United States of America, residing at Detroit, in the county of IVayne and State of Michigan, have invented certain new and useful Improvements in Blowpipes, of which the following is a specification, reference being had therein to the accompanying draW- lhe invention relates to Bunsen burner blow pipes and is more particularly designed for use in dentistry.

It is the object of the invention to obtain a construction in which theburner may be adjusted to any desired angle for directing the flame upon the work and the flame may be controlled without disturbing the position of the burner.

.To this end the invention consists in the construction as hereinafter set forth.

In the drawings,-Figure l is a perspective view of the blow pipe; Fig. 2 ifs a fragmentary, vertical, central cross section; Fig. 3 is a similar view showing a modified construction; F ig. 4 is a longitudinal section through the burner.

A is the base plate preferably of circular form and upon which the blow pipe is mounted, B is a tubular frame having a pivotal connection with the base which is formed by a round cross bar C engaging a transversely apertured post D having a threaded shank E engaging a correspondingly threaded aperture in the base. This construction permits of adjusting the tubular frame /B'at any desired angle to the base and in then clamping it in this position by screwing dovvn the post D which binds the cross bar C upon a boss F on the base surrounding the post.

vThe tubular frame B is formed of two parallel tubes or conduits arranged upon opposite sidesof the post D and constituting respectively the air and gas supply conduits to the burner. These parallelv conduits G and G are joined to the cross bar C, which latter constitutes a continuation of one of the conduits, and a nipple for attaching the flexible hose thereto. As shown in Figs. l and 2, the air conduit is attached to the nipple H formed on the cross bar C and the conduit extends through said cross bar to the tube G on the opposite side thereof.

Specification of Letters Patent.

j Application filed March 16, 1912.

Patented Aug. 1li, 191m. Serial No. 684,196.

The gas conduit is connected to a. nipple I secured to the tube G, being arranged in close proximity to the nipple H. In the modified construction shown in Fig. 3 the -nipples are formed upon opposite ends of the cross bar C in alineinent with each other.

Both constructions permit of adjusting the i l the angle of the tubular frame.

The burner J is pivotally mounted at the upper end of the tubular frame B and consists of a cylindrical air and gas mixing chamber centrally apertured at its outer end. lVithin this chamber is the air blast nozzle K which is connected with the air conduit G through the trunnion connection between said conduit and the burner. In like manner the gas conduit G is connected through the opposite trunnion with the burner and communicates with the mixing chamber surrounding the nozzle K. The trunnions L and L which form the mechanical connection between the tubular frame and burner form a ground joint with the latter, which is gas and air tight, and these trunnions also con! valves and are adjusted by thumb Wheels O and O in proximity to the trunnions, in which position they may be easily adjusted by the operator Without disturbing the angle of adjustment either of the tubular frame or of the burner J which is independently adjustable on the trunnions L, L.

lVith the construction-as described in use, the operator may adjust the tubular frame B to the required angle and the burner .I may be independently adjusted to properly direct the flame. The frame B is held rigid by clamping the same to the base through the rotative adjustment of the post D. The burner J is held in its position of adjustment by the friction of the trunnions L and L which are resiliently pressed against their seats in the burner by the tubes G and G. Inasmuch as the valves M and M engage the trunnions and Anot the burner, the adjustment of these valves will not disturb the angle of adjustment of the burner gas* tubes, flexible conduit engaging nipples but uthe flame Vmay .be regulated as desired. For Io'nvenience infV manufacture .Y the outerv case'if'fthe'burnerfis formed with a detachable cap portion, P which when re moved will expose the nozzle J and permit of assemblingthe parts.

"W'hat we claimas our invention is:

l. In a blow pipe, the combination with af,

base, of a tubular frame, a burner carried by sai'djt'ibul'nrVE frame, a cross Vbar on.` said fraiegvanda post forming a bearing for 'said y crossbar adjustably engagingsaid' base and 'l bular kframe indifferent positions of angular. V .l I

adjustnfient.l-Y` Y l j "2. In afblow pipe, thev combination with a base, of'a tubular frame;fcomprising spaced i'1f"and^gas' conduits, a cross bar, afpost carriedby said base to whichs'aidicross bar isivpivotally `conneeted`,*a"burner carried by 4 said-tubular frarne,'sa1'd vcross bar consti# tutirigran extension vof one of saidconduit's,

n 'and said post being adjustable =in relation tov the' base to constitute a clamp for holding said tubular frame in` dilerent positions @angular-adjustment.' l f 1 In la' blowf pipe, thecombin'a'tion with `a l='a'se,f"ofa1fra1ne comprising parallel air and upon Vfsz'iidtub'es; said'frame havinga Vcross portion'fpivotally connecting the frame with saidbase, a burner between said tubes at the y' upper endthereof, hollowmembers connectY ing said burner with said tubes, and controlling yalxjes within said'v hollow` :members having?r their operatinglstems 1n axial aline- VVnient. therewith.

Ll. In a blow .pipe,the combination with a l. lrarneecomprising .spaced air and gas conduits, ofl a burner at the upper end of said* Vframe arranged between the oonduits, hollow angle-shaped members carriedV by said conduits having bearing vfaces, cooperating bearing faces jon` the `louI'neL-,and valves within sa-.idlhollow membershaving their operating V"stems-in `axial v alinement therewith,sa'id burner being. held in itspo- I sition of adjustment by .the friction of sald hollow 'noenibers, whichare constructed to be resiliently pressed against: the f bearing 'surfaces on'the burnerlby the-spaced con` duits.'

5. In a blow pipe, the combmationwith av frame comprising spaced air `and; gas conduits, off a burneraty therru per-endof said frame arranged betweent e conduits, hollow members yconnecting` saidburner with Y said conduits, and controlling-valves within' 

